Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cistarte
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DI-141
DIAGNOSTICS - ENGINE
DI22K-03
Starter Signal Circuit
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after-start injection control.
WIRING DIAGRAM
Engine Room J/B No.2 ECM
5 3
3 MAIN 5
From Battery W B-R
2B 2D
1 2
3 11 9
GR GR F F GR
2J 1 2K
IH1
F J7 1 2 W-B
6 ST Relay
Junction
Park/Neutral Connector
Position Switch 8 IG1
1
5 S1
B-W
W-B
11 IH1
Starter
B-W 7 1G
C
J6 Driver Side
J/C J/B No.1
C
B-W 4 1Y
W-B
3 1J
7 STA
STARTER
GR
Instrument E8
Panel J/B
IG E1
4 1K
From Ignition Switch
A07529
2001 SIENNA (RM787U)
Author : Date : 295
DI-142
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the problem symptoms table on page DI-21 .
TOYOTA hand-held tester
1 Connect TOYOTA hand-held tester, and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand-held tester while starter operates.
OK:
Ignition switch position ON START
STA signal OFF ON
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-21 ).
NG
2 Check for open in harness and connector between ECM and starter relay
(See page IN-31 ).
NG Repair or replace or connector.
OK
Check and replace ECM (See page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 296
DI-143
DIAGNOSTICS - ENGINE
OBD II scan tool (excluding TOYOTA hand-held tester)
1 Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
ON
Remove the glove compartment (See page SF-83 ).
CHECK:
Measure voltage between terminal STA of the ECM connector
and body ground during engine cranking.
OK:
Voltage: 6 V or more
STA (+)
A07152 OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-21 ).
NG
2 Check for open in harness and connector between ECM and starter relay
(See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 297
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